<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length>0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div :class="{tr: true,active: item.isChecked}" v-for="(item,inded) in fruitList" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="decrease(item.id)"> - </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="increase(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{ item.price*item.num }}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" / v-model="isAll">
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalCount }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
  <script src="../vue.js"></script>
  <script>
    const defaultArr = [
      {
        id: 1,
        icon: 'http://autumnfish.cn/static/火龙果.png',
        isChecked: true,
        num: 2,
        price: 6,
      },
      {
        id: 2,
        icon: 'http://autumnfish.cn/static/荔枝.png',
        isChecked: false,
        num: 7,
        price: 20,
      },
      {
        id: 3,
        icon: 'http://autumnfish.cn/static/榴莲.png',
        isChecked: false,
        num: 3,
        price: 40,
      },
      {
        id: 4,
        icon: 'http://autumnfish.cn/static/鸭梨.png',
        isChecked: true,
        num: 10,
        price: 3,
      },
      {
        id: 5,
        icon: 'http://autumnfish.cn/static/樱桃.png',
        isChecked: false,
        num: 20,
        price: 34,
      },
    ]
    const app = new Vue({
      el: '#app',
      data: {
        //全选
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('fruitList')) || defaultArr,
      },
      methods: {
        // 删除
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        },
        decrease(id) {
          this.fruitList = this.fruitList.map(item => {
            if (item.id === id) {
              if (item.num >= 1) {
                item.num--
              } else {
                alert('已为空！')
              }
            }
            return item
          })
        },
        increase(id) {
          this.fruitList = this.fruitList.map(item => {
            if (item.id === id) {
              item.num++
            }
            return item
          })
        }
      },
      computed: {
        isAll: {
          get() {
            return this.fruitList.every(item => item.isChecked)
          },
          set(newValue) {
            this.fruitList.forEach(item => {
              item.isChecked = newValue
            })
          }
        },
        totalPrice() {
          return this.fruitList.reduce((total, item) => {
            if (item.isChecked) {
              total += item.price * item.num
            }
            return total
          }, 0)
        },
        totalCount() {
          return this.fruitList.reduce((total, item) => {
            if (item.isChecked) {
              total += item.num
            }
            return total
          }, 0)
        }
      },
      watch: {
        fruitList: {
          handler() {
            console.log(this.fruitList)
            localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
          },
          deep: true
        }
      }
    })
  </script>
</body>

</html>